Abstract: A vehicle display device includes a consumption efficiency information processing portion configured to display information on consumption efficiency of an energy source during driving of a vehicle on a display unit, in which the vehicle includes a consumption efficiency improvement portion configured to include a plurality of types of efficiency improvement functions contributing to an improvement in the consumption efficiency. The consumption efficiency information processing portion includes an actual improvement effect calculating portion individually configured to calculate an actual improvement effect on the consumption efficiency resulting from each of the plurality of types of efficiency improvement functions, and an improvement effect display control portion configured to display the actual improvement effect obtained for each of the plurality of types of efficiency improvement functions on the display in a manner where each of the actual improvement effects are mutually compared.